This may all be obvious but make sure to expand the download for Mac which is compressed, rename it “elm”, move it to /usr/local/bin, and run “chmod a+x /usr/local/bin/elm”. Make sure your elm.json, etc, now references “0.19.2” and that you have /usr/local/bin on your PATH and that you don’t have an old npm version of Elm hanging around, which you can uninstall.